Extending tests for detach (found a memory issue in it, this fixes that and now tests it).

client/mysqlslap.c:
  Fix memory allocation
mysql-test/t/mysqlslap.test:
  Extend test for --detach

client/mysqlslap.c

@@ -1804,6 +1804,13 @@ limit_not_met:
       {
         mysql_close(mysql);
 
+        if (!(mysql= mysql_init(NULL)))
+        {
+          fprintf(stderr,"%s: mysql_init() failed ERROR : %s\n",
+                  my_progname, mysql_error(mysql));
+          exit(0);
+        }
+
         if (slap_connect(mysql))
           goto end;
       }

mysql-test/t/mysqlslap.test

@@ -38,3 +38,5 @@
 --exec $MYSQL_SLAP --only-print --delimiter=";" --query="select * from t1;select * from t2" --create="CREATE TABLE t1 (id int, name varchar(64)); create table t2(foo1 varchar(32), foo2 varchar(32)); INSERT INTO t1 VALUES (1, 'This is a test'); insert into t2 values ('test', 'test2')" --engine="heap,myisam" --post-query="SHOW TABLES" --pre-query="SHOW TABLES";
 
  --exec $MYSQL_SLAP --only-print --delimiter=";" --query="select * from t1;select * from t2" --create="CREATE TABLE t1 (id int, name varchar(64)); create table t2(foo1 varchar(32), foo2 varchar(32)); INSERT INTO t1 VALUES (1, 'This is a test'); insert into t2 values ('test', 'test2')" --engine="heap,myisam" --post-query="SHOW TABLES" --pre-query="SHOW TABLES" --number-of-queries=6 --commit=1;
+
+--exec $MYSQL_SLAP --silent --concurrency=5 --iterations=1 --number-int-cols=2 --number-char-cols=3 --auto-generate-sql --auto-generate-sql-add-autoincrement --auto-generate-sql-load-type=write --detach=2